Scotograph :: Scotograph (n.) An instrument for writing in the dark, or without seeing..
Scotomy :: Scotomy (n.) Dizziness with dimness of sight.
Scotomy :: Scotomy (n.) Obscuration of the field of vision due to the appearance of a dark spot before the eye.
Scotoscope :: Scotoscope (n.) An instrument that discloses objects in the dark or in a faint light.